Fastly Surges 14% on AI Firewall Launch; Cloudflare and Datadog Rally

Key Facts

1Fastly shares surged 14% following the launch of a new AI firewall product for infrastructure traffic.

2Cloudflare and Datadog shares rose 7% and 5% respectively, tracking Fastly's gains despite no company-specific news.

In a move reflecting the accelerating demand for cybersecurity infrastructure, Fastly has launched new products dedicated to protecting AI traffic. According to reports, the company's shares surged 14% following the announcement of an AI Firewall and AI Runtime Control tools. These technologies aim to provide organizations with clearer visibility into token consumption and budget management without disrupting production workflows.

This positive momentum extended to sector peers despite a lack of company-specific news, as Cloudflare rose 7% and Datadog gained 5% in sympathy with Fastly. Per market data, NET closed at $323.60 and DDOG closed at $229.92 on September 18, 2026. This collective movement suggests investor optimism regarding the growing demand for edge security services linked to artificial intelligence models.

Looking at price levels, FSLY stood at $23.86 (close September 18, 2026) after reaching a day high of $24.98. Traders should watch for continued follow-through in the edge computing sector, especially following broader economic data such as the recently reported 1.2% growth in US Retail Sales, which may influence overall risk appetite for technology stocks.